Next you looked at some Joda concepts, and then how to use Joda to do date calculations and formatting.

然后介绍了一些Joda概念，以及如何使用Joda执行日期计算和格式化。

youdao

Now that you've seen how to create a few of the more useful Joda classes, I'll show you how to use them to perform date calculations.

现在，您已经了解了如何创建一些非常有用的joda类，我将向您展示如何使用它们执行日期计算。

youdao

The API methods I'll show you for doing date calculations all return a new instance of the corresponding Joda class, leaving the original instance unchanged.

我将向您展示的用于处理日期计算的API方法全部返回一个对应joda类的新实例，同时保持原始实例不变。

youdao

It is celebrated on 21 March every year, a date originally determined by astronomical calculations.

UNESCO: Culture

No servicer has a data repository with automated processing rules designed to keep files and calculations up to date with the constant changes.

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When that day came and went, Weinland amended his calculations, claiming an error and revising the date to May 27, 2012.

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